“It is impossible to give a full list of all the situations where the Interest Review Unit may consider giving up interest. The main considerations must be that: · interest was increasing during the period involved, and · HMRC was responsible for the conduct of the case during the period, and · the delay was extensive and unreasonable in the circumstances, and · it was only this delay that caused the absence of payment, and · the customer was not aware that a debt existed, or might arise, that they should have paid or made a payment on account against. So if the interest was building up already, or was going to build up, on a delayed payment as a result of the customer’s actions, then there is no reason for the Interest Review Unit to consider giving up interest. The customer was already going to be facing an interest charge. HMRC delay, no matter how long, did not cause the charge. The question to ask for every case is, ‘would the interest charge still have existed if HMRC had not caused any unreasonable delay?’ If ‘yes’ then the interest charge should be upheld. If ‘no’ then consider giving up interest.”